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Doornfontein

Producer in South Africa with commodities Gold, PGE, Silver
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Geologic information

Identification information

Deposit ID 10207522
MRDS ID M046307
MAS/MILS ID 7910200075
Record type Site
Current site name Doornfontein
Related records 10038844

Geographic coordinates

Point of reference Claim
Geographic coordinates: 27.30146, -26.4266 (WGS84)
Elevation 1600
Location accuracy 1000(meters)
(click for info)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
PGE Tertiary
Silver Secondary

Materials information

Materials Type of material
Gold Unknown
Pyrite Unknown
Quartz Unknown
Silver Unknown
Uraninite Unknown

Nearby scientific data

Claim (1) 27.30146, -26.4266
ListMap

Ore body information

  • Strike N80E
    Dip 20S
    Thickness 1.1M
    Depth to top 2500M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STRATIFORM
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Strike And Dip N80E
    Minimum Depth to Top 1750
    Date of Last Modification 851227
  • Strike N80E
    Dip 20S
    Thickness 1.2M
    Depth to top 2500M
    Field Value
    MAS Matrix # 2
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STRATIFORM
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Strike And Dip N80E
    Minimum Depth to Top 1750
    Date of Last Modification 851227
  • Area 4548HA
    Field Value
    Total Surface Area (HA) 4548
    Date of Last Modification 910418

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Metallic
Significant Yes
Year of first production 1953
Milling method Hydrometallurgy Unspecified

Mining district

District name Orange Free State Gold Fields

Mineral rights holdings

Type of mineral rights Federal Lease

Ownership information

  • Type Owner-Operator
    Owner Dornfontein Gold Mining Co. Ltd.
    Interest 100
    Home office South Africa
    Year 1982
  • Type Owner
    Owner Gold Field Group
    Home office South Africa
    Year 1982

Production statistics

  • Year 1976
    Description 1403999 Mt Of Ore Milled/Yr
  • Year 1977
    Description 1308999 Mt Of Ore Milled/Yr
  • Year 1978
    Description 1429999 Mt Of Ore Milled/Yr
  • Year 1979
    Description 1440000 Mt Of Ore Milled/Yr
  • Year 1980
    Description 1440000 Mt Of Ore Milled/Yr
  • Year 1981
    Description 1440000 Mt Of Ore Milled/Yr

Reserves and resources

  • Type In-situ
    Estimate year 1993
    Demonstrated 820,000mt ore
    Total resources 820,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 14.9 g/mt Gold Major 1993

Comments on the reserve resource information

  • WAS UPDATED FOR THE 1992 AU AVAILABILITY STUDY. 1989 PROD.= 255,023 OZ. AU FROM MILLING OF 1,560,950 MT ORE. 1991 PROD. =220,326 OZ FROM TREATING 1,386,000 TNS ORE.
  • M3C1=M1C1+M2C1. DEMONSTRATED RESOURCE INCLUDES 36 M MT OF CARBON LEADER REEF AND 12 M MT OF MAIN REEF.

Workings at the site

  • Type of workings Underground
    Overall depth 1750M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method BREAST STOPING 10-30
    Percent Waste Rock 42.3
    Percent Recovery 100
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Number of Shafts 3
    1st Condition of Workings OPEN
    Capacity 4114
    Capacity Units MT ORE/DAY
    Unit Production Cost 45.39
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1982

Comments on other economic factors

  • SMELTING OPERATING COST OF GOLD INCLUDES SMELTING OP COST OF SILVER AND REFIMING COSTS OF GOLD AND SILVER.
  • MILL IS LOCATED ON NORTHEAST SECTION OF MINE PROPERTY. OSMIRIDIUM CONCENTRATE CONTAINS 36% OSMIUM, 33% IRIDIUM, 14% RUTHINIUM, 90% PLATINUM, AND 1% RHODIUM, AT CONCENTRATE GRADE OF 0.004 G/MT. DORE BULLION IS TRUCKED TO RAND REFINERY, FOR FURTHER SEPARATION OF GOLD AND SILVER.
  • THERE ARE THREE MINING COMPLEXES, EACH WITH 1 SURFACE SHAFT, 1 SUB-VERT. SHAFT, AND 1 INCLINED SHAFT, FOR MINING BETWEEN 1750 METERS AND 3300 METERS IN DEPTH.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910200075
USGS Mineral Resources Data System MRDS M046307 MAS references MRDS

Bibliographic references

  • Geology

    ANHAEUSSER, C.R. 1976, THE NATURE AND DISTRIBUTION OF

  • Geology

    ARCHAEN GOLD MINERALIZATION IN SOUTHERN AFRICA. MINERALS

  • Geology

    SCI. ENGNG., V. 8, NO. 1, PP. 46-84.

  • Geology

    BOYLE, R.W. 1979, THE GEOCHEMISTRY OF GOLD AND IT'S

  • Geology

    DEPOSITS. GEOLOGICAL SURVEY OF CANADA, BULL. 280, 584 PP.

  • Geology

    HAUGHTON, S.H., ED. 1964A, THE GEOLOGY OF SOME ORE

  • Geology

    DEPOSITS IN SOUTHERN AFRICA. V. 1, GOLD DEPOSITS OF THE

  • Geology

    WITWATERSRAND BASIN. GEOL. SOC. S. AFRICA, JOHANNESBURG,

  • Geology

    625 PP.

  • Geology

    LIEBENBERG, W.R. 1972, MINERALOGICAL FEATURES OF GOLD

  • Geology

    ORES IN SOUTH AFRICA. PUBLISHED IN GOLD METALLURGY IN SOUTH

  • Geology

    AFRICA, EDITED BY R.J. ADAMSON. CHAMBER OF MINES OF S. AFR.

  • Geology

    MINTER, U.E.L. 1976, DETRITAL GOLD, URANIUM, AND PYRITE

  • Geology

    CONCENTRATIONS PILATED TO SEDIMENTOLOGY IN THE PRECAMBRIAN

  • Geology

    VAAL REEF PLACER, WITWATERSRAND, SOUTH AFRICA. ECONOMIC

  • Geology

    GEOLOGY, V. 71, PP. 157-176.

  • Geology

    PRETORIUS, D.A. 1981, GOLD AND URANIUM IN QUARTZ-PEBBLE

  • Geology

    CONGLOMERATES. ECONOMIC GEOLOGY 75TH ANNIVERSARY VOLUME,

  • Geology

    PP. 117-138.

  • Geology

    PRETORIUS, D.A. 1975, THE DEPOSITIONAL ENVIRONMENT OF

  • Geology

    THE WITWATERSRAND GOLDFIELDS. A CHRONOLOGICAL REVIEW OF

  • Geology

    SPECULATIONS AND OBSERVATIONS. MIN. SCI. ENGNG., V. 7,

  • Geology

    NO. 1, PP. 18-47.

  • Geology

    SMITH, N.D., AND W.E.L. MINTER. 1980, SEDIMENTOLOGICAL

  • Geology

    CONTROLS OF GOLD AND URANIUM IN TWO WITWATERSRAND PALEO-

  • Geology

    PLACERS. ECONOMIC GEOLOGY, V. 75, PP. 1-14.

  • Production

    ADAMSON, R.J. (ED.). 1972, GOLD METALLURGY IN SOUTH

  • Production

    AFRICA, CHAMBER OF MINES OF SOUTH AFRICA, 452 PP.

  • Production

    FINANCIAL TIMES. 1981, MINING INTERNATIONAL YEARBOOK

  • Production

    (SELECTED EXCERPTS).

  • Production

    KING, A.. 1949, GOLD METALLURGY ON THE WITWATERSRAND.

  • Production

    TRANSVAAL CHAMBER OF MINES, 458 PP.

  • Production

    MCQUISTON, F.W. AND R.S. SHOEMAKER. 1975, GOLD AND

  • Production

    SILVER CYANIDATION PLANT PRACTICE. SOCIETY OF MINING ENG.

  • Reserve-Resource

    ANNUAL REPORTS - VAAL REEFS EXPLORATION AND MINING

  • Reserve-Resource

    COMPANY LTD., 1981.

  • Reserve-Resource

    AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 23.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1981, RAND REFINERY,

  • Deposit

    P.R.D. SERIES NO. 255, 20PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1980, GOLD IN SOUTH

  • Deposit

    AFRICA, P.R.D. SERIES NO. 241, 28PP.

  • Deposit

    CHAMBER OF MINES, 1980, OVERVIEW OF THE SOUTH AFRICAN

  • Deposit

    MINING INDUSTRY.

  • Deposit

    ELEVATORSKI, E.A. 1981, GOLD MINES OF THE WORLD.

  • Deposit

    PUBLISHED BY MINOBRAS, PP. 78-86.

  • Deposit

    POTTS, D. 1981, THE SOUTH AFRICAN GOLD MINING INDUSTRY,

  • Deposit

    1981. PUBLISHED BY CONSOLIDATED GOLD FIELDS, LTD., PP.17-85.

  • Deposit

    GOLD INSTITUTE. 1981, GOLD REGULATIONS AND TAXES FOR

  • Deposit

    MINING, REFINING, MANUFACTURING AND TRADE IN THIRTEEN

  • Deposit

    COUNTRIES. PP. 74-79.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA. 1982, ANALYSIS OF

  • Deposit

    WORKING RESULTS, OCTOBER-DECEMBER, 1981, 8 PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA. 1981, 91ST ANNUAL

  • Deposit

    REPORT AND STATISTICAL TABLES. 116 PP.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES. 1982, PRODUCTION AND

  • Deposit

    CAPITAL EXPENDITURES FOR THE SOUTH AFRICAN GOLD MINES, 1966-

  • Deposit

    1981.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES. 1982, SUMMARY REPORT

  • Deposit

    OF PRODUCTION AND RECOVERY FOR THE SOUTH AFRICAN GOLD MINES,

  • Deposit

    1966-1981.

  • Deposit

    MOHIDE, T.F. 1981, GOLD MINERAL POLICY BACKGROUND PAPER

  • Deposit

    NO. 12. ONTARIO MINISTRY OF NATURAL RESOURCES, PP. 84-112.

  • Deposit

    STORRAR, C.D. 1981, SOUTH AFRICAN MINE VALUATION.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 470 PP.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-94 Boyle, Ed U.S. Bureau of Mines